Carburetor



July 11, 1933. w. w, zlNNAMoN 1,918,168

CARBURETOR Filed Dec. l, 1952 Patented July 11, 1933 UNITED STATES WILLIAM W. ZINNAMON, OF TULSA, OKLAHOMA CARBURETOR Application filed December This invention relates to certain new and useful improvements in *arbnretors The primary object of the invention is to provide a carburetor especially designed for the use of natural gas and embodies valve mechanism operative at slow starting speed for the passage therethrough to the throttle valve of an excess quantity of gas with respect to air fed to the carburetor to facilitate starting of an internal combustion engine with the subsequent operation of a main.` valve accomplished automatically in the presence of increased suction in the intake manifold with a regular bow teusioned air valve to insure roper proportions of gas and air through t e engine. l

lVith the above and other objects in view that Will become apparent as the nature of the invention is better understood, the saine consists in the novel form, combination and arrangement of parte hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing Figure 1 is a side elevational view of a carburetor constructed in accordance with the present invention and especially designed for the use of natural gas;

Figure 2 is a vertical longitudinal sectional view of the carburetor showing the non-seating -tensioned air inlet valve with the main floating gas control valve and auxiliary valve carried by the main valve ;V

Figure 3 is a cross-sectional vieuT taken on line 3 3 of Figure 2 showing the radial pary titions in the mixing chamber of the carburetor; and` Figure et is a perspective view of the main gas valve in the carburetor.

Referring more in detail to the accompanying drawing, there is illustrated a carburetor designated in general by the reference characte-r and including a. body portion 11 carrying a head 12, the body 11 having a lateral tube connection 13 with an air chamber 14.

The body 11 in the form of a chamber as shown in Figure 2 is provided with a bottom Wall 15 having a central opening therein forming the valve seatl 16 and a depending 1, 1932. Serial No. 645,151.

internally threaded nipple 17 to facilitate attachment of the carburetor body With a natural gas supply pipe or other conduit.v

The upper end of the body 11 is ground to provide a valve seat 18, the head 12 having a base liange 19 clamped upon the upper end` of the body in surrounding relation to the valve seat 18. The head 12 has an upstanding reduced neck portion 20 With a main gas throttle valve 21 pivoted therein and operated by the exteriorly positioned lever 22, the upper end of the neck 2O carrying an apertured flange 23 to facilitate attachment of the vcarburetor to the intake manifold of an internal combustion` engine. In actual practice this carburetor has especially demonstrated high eiiiciency when employed upon four, six and eight cylinder high-speed in` ternal combustion engines. y

The valve mechanism confined Within the body 11 and head 12 includes a tubular valve stem 24 having a conical valve 25 upon its lower end cooperating with the valve seat 16 of the carburetor body, inclined ports 26 in the conical valve`25 forming communication between the gas supply pipe or conduit and the bore 24a inthe tubular valve stem 2&1. When the conical valve25 is engaged With lits seat 16, the upper end of the tubular valve stein 24 terminates above the valve seat 18, the upper end of the tubular valve stem 24 being externally threaded to receive the threaded central bushing 27 of the main disk valve 28 that is retained'in position on the valve stem by the jamb nut 29.

The auxiliary valve includes a disk 30 mounted upon the upper side of the main dislr valve 28 andis mounted thereon for limitedv movement by means of the headed pms 31v extending through openings in the peripheral ed ge of the valve 38 and anchored in the main valve 28, the auxiliary disk valve 28 cooperating with the valve openings 32 arianged in circular series in the main valve 28.

'.lhe valve mechanism including the tubular stem 211, main and auxiliary valves and conical valve 25 is loosely mounted in the carburetor, being guided at its lower end by the piu 38 depending from the conical valve 25 and extending ,into the nipple 17 While the upper end of the valve mechanism is guided in its movement by the radial ribs 34 extending inwardly trom the side walls et the head 12 as shown in Figures 2 and Four ot these ribs 34 are preferably provided and divide the lower end of the head 12 Iinto tour mixing chambers for air and gas entering the head by way of the valve mechanism.

As shown in Figure 2, the tube 13 terms unobstructed communication between the air chamber 14 and the body portion 11 ot the carburetor, the valve mechanism in the air chamber 1i.V for controlling the admission ot air therein through the body opening 35 comprisinga valve stem 3G carrying a disk valve 37 at its lower end and extending upwardly through the top wall 38 of the air chamber and adjustable threaded bushing 39 tor receive a nut 40 upon its upper terminal end adjustably threaded thereon with a coil spring Ll1 interposed between the nut and upper end et the bushing- 39. The lower end ot the valve stem within the air chamber 1l is surrounded by a coil spring 42 engagingl at its lower end, the disl 43 seated ou the valve plate 37 and engaged at its upper end with the disk plate Llei surrounding the valve stem 36 and engaged with the lower end ot the bushing The valve 37 is non-seating with respect to the air opening 35 in the lower end ot the air chamber 14, the two springs l2 and Ll1 being` variably tensioned by means et the adj ustiug nut l() to regulate the amount et air to pass through the opening 35 into the air chamber and automatirally operating to permit further movement of the valve 3T away from the air opening 35 in the presence of increased suction conditions in the intake manifold of an internal combustion engine for the proper admixture of air and gas flowing through the carburetor.

' lhen the internal combustion engine is at rest, the conical valve 25 is engaged with the valve seat 16, the dislr valve 28 engaged with. the valve seat 18 while the auxiliary disk valve 30 closes the valve openings 32 in the disk valve 28. To start the engine at slow speed, the suction initially created in the intake manifold of the engine unseats the auxiliary valve 30 to uncover the openings 32 in the main valve disk 28. liowing through the inclined ports 26 and bore 24a in the tubular valve stem 2l andthrough the reduced openings in the upper end of the bore 21a, to be directed laterally by the auxiliary disk valve 30 while air from the chamber 14 tlowing therethrough by way oi the bottom opening 35 passes through the openings 32 in the main valve disk 28 for admixture with the gas. When suction in the intake manifold of the gas engine increases, the main disk valve 28 is unseated or raised from the valve seat 18, the gas then flowing by way of the valve opening 16 to be directed laterally by the main disk valve 2S, the auxiliary valve 30 then gravitationally closing upon the main valve, the intake of air travelling in the saine direction by way ot' the valve 23 and into the mixing chamber above the inain valve. lncreased suction in the engine operates to move the disk valve 37 of the air control away from the opening 35 to increase the area thereotl i'or the proper admixture ot gas and air. rlhe initial feeding ot the gas by the unseating of the auxiliary valve 30 prevents the Vflooding ot the engine with gas and thereby restricts the gas toed to the engine at slow starting speed.

From the above detailed description of the invention, it is l elicved that the construction and operation thereetl will at once be apparent and while there is herein shown and described the iircterred embodiment 'of the invention, it is nevertheless to be understood that minor changes may be made therein without depzu'tingl 'from the spirit and scope et theinvention as claimed.

I claim i 1. n a natural gas carburetor, a body, an air inlet chamber, a conduit connecting the body and air chamber, a non-seating variably tensioned valve in the air chamber, floating valve mechanism in the body to control the llowV ot vair and gas therethrough, including a tubular valve stem, a main valve, a valve on the stem, controlling flow of gas t`o the main valve and an auxiliary valve on the main valve, means forming unobstructed communication between the gas supply and bore of the tubular valve stem and said main valve having air passage openings therein normally closed by the auxiliary valve.

2. ln a natural gas carburetona body, an air inlet chamber, a conduit connecting the body and air chamber, a non-seating variably tensioned valve in the air chamber, and floating valve mechanism in the body to control the iow of air and gas therethrough, including a tubular valve stem having a valve at its lower end engageable with a seat for controlling flow of gas into the body, a main valve on the upper end of the stem engageable with a seat in the body, the valve at the lower end of the stem being constructed for admitting gas to the bore ot' the tubular valve stem and auxiliary valve carried by the main valve for closing the bore at the upper end of the tubular valve stem.

3. In a natural gas carburetor, a body, an air inlet chamber, a conduit connecting the body and air chamber, a non-seating variably tensioned valve in the air chamber, and {loating valve mechanism in the body to control the flow otl air and gas therethrough, incl uding a tubular valve stem having a valve at its lower end engageable with a seat for controlling flow of gas into the body, a main valve on the upper end of the stem engageable with a seat in the body, the valve at the lower end of the stem being constructed for admitting ISD gas to the bore of the tubular valve stein and auxiliary valve carried by the main valve for closing,` Jthe bore at che upper end oli' `the 1tubular valve stem, and `the main valve havingl air passage openings J@herein adapted to be closed by he auxiliary valve when the inain valve is unseated.

4. ln a natural ,gas Carburetor, a body, an air inlet Chamber, a conduit eonneclingdie body and air chamber, a non-seating variably Jfeneioned valve in the air chamber, floating valve mechanism in the body to Control the loiv of air and gas therethrough, ineludinga` tubular valve Stem, a main valve, a

valve on the Stein, Controlling' flow o'f gaa to the main valve and an auxiliary valve on the main valve, means forming unobetrueted communication betiveen the gas supply and bore of 1the tubular valve Sem and said main valve having; air passage openings Ltherein normally closed by the auxiliary va ve, and radial ribs projectingl inwardly of the body forming' a guide for the inain ralve and providing.' a Series of air and gaa mixing chainbers above the main valve ln a natural tgas Carburetor, a body, an air inlet Chamber, a conduitconneotine the bodyand air chamber, i non-seating' variably tensioned valve in the air Chamber, and floating' valve mech anism in the body 1o control the flow oi air and gas thereihrough, i neludingi` a tubular valve Stein having' a valve at its lower end engapgeable with a Seat for controlling floiv of gas into the body, a main valve on the upper end of the stein engageable with a seat in the body, thevalve at the loiver end of the Stem being Constructed for admitting .gas to the bore of the tubular valve stein and auxiliary valve Carried by the main valve for closing the bore at the upper end of tbe tubular valve stem, and radial ribs projecting inwardly of the body forming` a guide for the main valve and providing a Series of air and gas mixing chambers above the main valve.

G. ln a Juubular gas Carburetor, a body, an air inlet elianibena conduit connect-ing the body and air chamber, anon-seating vari ably teneioned valve in the air eha1nber,and viloaing valve mechanism in bhe body to con- Jrol the flow of air and gas therethrough, in eluding a tubular valve stem having a valve ai; its lower end engage-able with a seal for controlling flow of gas into the body, a Inain valve on the upper end of lie stem engageable with a seatin the bory, `the valve at the lower end of ihe stem being' Constructed for admitting gas to the bore of the tubular valve allein and auxiliary valve carried by the main valve for closing' the bore at the upper end of the tubular valve stein, and the main valve having' air passage openings lherein adapt-ed lio be closed by the auxiliary valve when the main valve is unseated, and radial ribs projeeting inwardly oi' the body forming a guide ior the main valve and providing a eeries of air and `gas mixing chambers above the main valve.

ln testimony whereof I ail'lix my signature.

VILLIAM TVV. ZIN NAMON. 

